8. Calculează: a) (125:5-140:2): (-9) + (-324): (-18); b) [13-(-15)-(22-9-3)]-(-5) - 900; c) 50+2 (40-8 [30+3 (10-45: 3)]}; d) 12+ {[(8²-10²): 6-(7-15-50-3)] 3): (-13); e) [(-2)4-2-(-5)² +3 (10:2-9)] · 5; f) [3-(-3)²-(-3) 10:312-210.216: 223]: 5; g) 819:[415. (-2) 20+ (28:23) 10] : [(-20)-2-2²-23 - 1]; h) (-5) 10⁰0: {[(-5)4]5 (-5) 38 (520)2 -2.(-5) 85: 530-544+ (-6). (1549:37) D TT A W V​